Jobs at Rakuten Group, Inc.

Lead proactive, hypothesis-driven threat hunts across endpoint, network, and cloud environments; research adversary TTPs (MITRE ATT&CK); develop detections, automate analyses with scripting and ML/LLMs; collaborate with detection engineering, SOC, CTI, and IR teams; perform deep technical forensics and telecommunication-specific threat analysis to improve detection and response.

Lead formation, negotiation, funding applications, and management of government-funded R&D projects. Coordinate with global sales, ministries, and financial institutions; prepare and submit reports during and after project execution.

Manage accounting and financial compliance for government‑funded R&D projects: bookkeeping, expense verification, fund monitoring, budget vs. actual reporting, asset management, and audit responses for ministries and external auditors.

Manage accounting and financial compliance for government-funded R&D projects: bookkeeping, expense verification, budget vs. actual tracking, asset management, fund monitoring, and audit responses while coordinating with internal and external stakeholders.

Mid-career recruiter responsible for end-to-end hiring for Rakuten Mobile/Total Solutions/Symphony: gathering hiring needs, creating job descriptions, managing KPIs, vendors and media, conducting interviews and offers, candidate follow-up, and occasional university recruiting projects. May cover both business and engineering roles and could move into HR management.

Lead structuring, proposal, budgeting, compliance, and management of government-funded R&D projects. Negotiate with ministries and government-affiliated finance institutions, coordinate with global sales and stakeholders, manage budgets, risks, audits, and reporting for project implementation and closeout.

Manage payroll calculations (including inhabitant tax and year-end adjustments), handle social insurance procedures, collect/manage personal identification numbers, respond to employee inquiries, manage contractors, and lead process improvements and automation projects in HR/labor affairs.

Lead end-to-end new business initiatives for a telco digital strategy team: market and competitive analysis, TAM/SAM/SOM sizing, business case and financial modeling, partnership structuring and negotiation support, project delivery, KPI definition, executive presentations, and mentoring junior analysts.

Lead end-to-end contact center and customer support transformation: assess operations and CX metrics, define future-state operating models, recommend AI/automation technologies, translate business needs into technical specifications, run stakeholder workshops, build business cases, and oversee phased implementation of omni-channel, AI-enabled support solutions.

Provide L2/L3 troubleshooting and operational support for 5G Core (5GC) and cloud-native core network services. Resolve multi-vendor core and cloud infrastructure issues, perform audits and KPI analysis, implement improvements, execute configuration changes, maintain documentation and knowledge base, and participate in on-call rotations to meet SLAs.

Provide L2/L3 troubleshooting and operations for 5G Core (5GC) and virtualized core elements. Support multi-vendor packet core products, container-based infrastructure, vendor escalations, audits, KPI analysis, change implementation, incident leadership, and documentation. Collaborate with partners and internal teams, participate in on-call rotation, and support night/weekend maintenance. Work from Tokyo office.

Lead RF planning, optimization, and deployment across the region; drive AI/ML-enabled autonomous network transformation; oversee design readiness, vendor delivery, performance management, and RF team capability development.